2PCS 3.28ft black 2.1mm x 5.5mm DC Plug Extension Cable for Power Adapter, 12v dc extension,2.1mm extension,22AWG 2.1mm x 5.5mm DC Plug Extension Cable, 3.28 ft, 22 AWG Female connector: accepts 2.1mm x 5.5mm barrel plug Male DC Plug: 2.1mm inner dia. x 5.5mm outer dia. barrel plug Recommended for DC 3volt to 24volt, Max load 3amp or less This cable will only work with power adapter with 2.1mm x 5.5mm plug and not other sizes.